Stitches per Inch to Pitch

Convert stitches per inch to hole spacing in millimetres.

Tool Operation Area

Convert stitches per inch to hole spacing in millimetres.

Stitches per inch: 8 SPI.

Result: 3.175 mm per stitch.

25.4 ÷ stitches per inch.

Schematic diagram of the calculation.

Is this an exact workshop measurement?

The result follows the formula shown above. Check measurements and allow for real-world variation.

Budget saddle-stitch thread with explicit assumptions or a measured seam sample.

Balance stitch holes across an edge with even end margins.

Cut a belt to the right blank length with correctly spaced holes.